TW201922529A - Bicycle hub assembly - Google Patents

Abstract

A bicycle hub assembly comprises a hub axle, a hub body, and a sprocket support structure. The hub axle includes an axle through-bore that has an axle minimum inner diameter equal to or larger than 13 mm. The hub body has a first body end and a second body end opposite to the first body end in an axial direction with respect to a rotational center axis. The sprocket support structure is rotatably mounted on the hub axle about the rotational center axis. The sprocket support structure includes a first torque-transmitting profile and a first externally-threaded portion. The first torque-transmitting profile is configured to transmit a rotational force. The first externally-threaded portion is configured to threadedly engage with a first internally-threaded portion of a first lock member. The first torque-transmitting profile is closer to the first body end than the first externally-threaded portion in the axial direction.

Description

Bicycle wheel assembly

The invention relates to a bicycle hub assembly.

Bicycling is becoming an increasingly popular pastime and mode of transportation. In addition, cycling has become a very popular sport for both amateurs and professionals. Whether the bicycle is used for recreation, transportation or competition, the bicycle industry is constantly improving the various components of the bicycle. One bicycle component that has been extensively redesigned is a wheel hub assembly.

According to a first aspect of the present invention, a bicycle hub assembly includes a hub shaft, a hub body, and a sprocket support structure. The hub shaft includes a shaft through hole having a minimum inner diameter of one shaft equal to or greater than 13 mm. The hub body is rotatably supported on the hub shaft about a rotation center axis of the bicycle hub assembly. The hub main body has a first main body end and a second main body end opposite to the first main body end in an axial direction about the rotation center axis. The sprocket support structure is rotatably mounted on the hub shaft around the rotation center axis of the bicycle hub assembly. The sprocket support structure includes a first torque transmission pattern and a first externally threaded portion. The first torque transmission pattern is configured to transmit a rotational force between the sprocket support structure and a bicycle sprocket assembly. The first externally threaded portion is configured to be threadedly engaged with a first internally threaded portion of a first locking member. The first torque transmission pattern is closer to the first main body end than the first externally threaded portion in the axial direction.

By using the bicycle hub assembly according to the first aspect, it is possible to suppress the enlargement of the bicycle hub assembly, using the first torque transmission type and the first external thread portion will have a wider transmission ratio range The bicycle sprocket assembly is mounted to the bicycle hub assembly. In addition, the minimum inner diameter of the axle allows a wheel fastening shaft having a larger outer diameter to extend through the axle through hole of the hub shaft, thereby improving the strength of the wheel fastening shaft.

According to a second aspect of the present invention, the bicycle hub assembly according to the first aspect is configured such that the first torque transmission pattern includes internal flowers configured to interact with one of the bicycle sprocket assemblies. The key teeth engage at least one external spline tooth. The at least one external spline tooth has a large external spline diameter that is larger than the minimum internal diameter of the wheel shaft through-hole of the wheel shaft. A difference between the large diameter of the external spline and the minimum internal diameter of the axle is equal to or less than 22 mm.

With the bicycle hub assembly according to the second aspect, it is possible to further improve the strength of the wheel fastening shaft by suppressing the enlargement of the bicycle hub assembly.

According to a third aspect of the present invention, the bicycle hub assembly according to the second aspect is configured so that the difference between the large diameter of the external spline and the minimum internal diameter of the axle is equal to or less than 21 mm.

With the bicycle hub assembly according to the third aspect, it is possible to further improve the strength of the wheel fastening shaft by suppressing the enlargement of the bicycle hub assembly.

According to a fourth aspect of the present invention, the bicycle hub assembly according to the second aspect is configured so that the difference between the large diameter of the external spline and the minimum inner diameter of the axle is equal to or greater than 13 mm.

With the bicycle hub assembly according to the fourth aspect, it is possible to ensure the strength of the at least one external spline tooth of the first torque transmission type.

According to a fifth aspect of the present invention, the bicycle hub assembly according to any one of the first to fourth aspects is configured so that the first torque transmitting pattern includes at least one external spline tooth, It is configured to mesh with one of the internal spline teeth of the bicycle sprocket assembly. The at least one external spline tooth has a small external spline diameter that is larger than the minimum internal diameter of the wheel shaft through-hole of the wheel shaft. A difference between the small diameter of the external spline and the minimum internal diameter of the axle is equal to or less than 20 mm.

With the bicycle hub assembly according to the fifth aspect, it is possible to further improve the strength of the wheel fastening shaft by suppressing the enlargement of the bicycle hub assembly.

According to a sixth aspect of the present invention, the bicycle hub assembly according to the fifth aspect is configured so that the difference between the outer spline small diameter and the minimum inner diameter of the axle is equal to or less than 19 mm.

With the bicycle hub assembly according to the sixth aspect, it is possible to further improve the strength of the wheel fastening shaft by suppressing the enlargement of the bicycle hub assembly.

According to a seventh aspect of the present invention, the bicycle hub assembly according to the fifth aspect is configured so that the difference between the outer spline small diameter and the minimum inner diameter of the axle is equal to or greater than 12 mm.

With the bicycle hub assembly according to the seventh aspect, it is possible to ensure the strength of the at least one outer spline tooth of the first torque transmission type.

According to an eighth aspect of the present invention, the bicycle hub assembly according to any one of the first to seventh aspects is configured so that the first externally threaded portion has a diameter larger than one of the smallest inner diameters of the axle. A large diameter external thread. A difference between the major diameter of the first external thread and the smallest inner diameter of the axle is equal to or less than 19 mm.

With the bicycle hub assembly according to the eighth aspect, it is possible to further improve the strength of the wheel fastening shaft by suppressing the enlargement of the bicycle hub assembly.

According to a ninth aspect of the present invention, the bicycle hub assembly according to the eighth aspect is configured so that the difference between the first outer thread large diameter and the minimum inner diameter of the axle is equal to or less than 18 mm .

With the bicycle hub assembly according to the ninth aspect, it is possible to further improve the strength of the wheel fastening shaft by suppressing the enlargement of the bicycle hub assembly.

According to a tenth aspect of the present invention, the bicycle hub assembly according to the eighth aspect is configured so that the difference between the first outer thread large diameter and the minimum inner diameter of the axle is equal to or greater than 11 mm .

With the bicycle hub assembly according to the tenth aspect, it is possible to ensure the strength of the first externally threaded portion of the sprocket support structure.

According to an eleventh aspect of the present invention, the bicycle hub assembly according to any one of the first to tenth aspects is configured so that the sprocket support structure has the wheel shaft that is larger than the wheel shaft through hole. An inner diameter of a support with a minimum outer diameter. The difference between the minimum outer diameter of the support and the minimum inner diameter of the axle is equal to or less than 15 mm.

With the bicycle hub assembly according to the eleventh aspect, it is possible to mount a sprocket having a smaller inner diameter on the sprocket support structure of the bicycle hub assembly.

According to a twelfth aspect of the present invention, the bicycle hub assembly according to the eleventh aspect is configured so that the difference between the minimum outer diameter of the support and the minimum inner diameter of the axle is equal to or less than 14 mm .

With the bicycle hub assembly according to the twelfth aspect, it is possible to mount a sprocket having a smaller inner diameter to a sprocket support structure of the bicycle hub assembly.

According to a thirteenth aspect of the present invention, the bicycle hub assembly according to the eleventh aspect is configured so that the difference between the minimum outer diameter of the support and the minimum inner diameter of the axle is equal to or greater than 7 mm .

With the bicycle hub assembly according to the thirteenth aspect, it is possible to ensure the strength of the sprocket support structure of the bicycle hub assembly.

According to a fourteenth aspect of the present invention, the bicycle hub assembly according to any one of the first to thirteenth aspects further includes a bearing disposed between the sprocket support structure and the hub shaft, The sprocket support structure is rotatably supported relative to the hub shaft.

With the bicycle hub assembly according to the fourteenth aspect, the bearing enables the sprocket support structure to rotate more smoothly around the rotation center axis relative to the hub shaft.

According to a fifteenth aspect of the present invention, the bicycle hub assembly according to the fourteenth aspect is configured so that the hub shaft includes an inner peripheral surface of a wheel shaft defining a through hole of the wheel shaft. The bearing includes a plurality of rolling elements. The plurality of rolling elements are radially closer to the inner peripheral surface of the axle than to the first torque transmission pattern.

With the bicycle hub assembly according to the fifteenth aspect, it is possible to make the bearing smaller.

According to a sixteenth aspect of the present invention, the bicycle hub assembly according to any one of the first to fifteenth aspects is configured so that the minimum inner diameter of the axle of the axle through hole is equal to or greater than 14 mm.

With the bicycle hub assembly according to the sixteenth aspect, it is possible to further improve the strength of the wheel fastening shaft because the wheel fastening shaft can have a larger outer diameter.

According to a seventeenth aspect of the present invention, the bicycle hub assembly according to any one of the first to sixteenth aspects is configured so that the minimum inner diameter of the axle of the axle through hole is equal to or less than 21 mm.

With the bicycle hub assembly according to the seventeenth aspect, it is possible to obtain a necessary internal space between the sprocket support structure and the hub shaft, and thereby improve one degree of freedom in designing the bicycle hub assembly. .

According to an eighteenth aspect of the present invention, the bicycle hub assembly according to any one of the first to seventeenth aspects is configured so that the hub axle has a maximum outer diameter of one axle equal to or greater than 17 mm. path.

With the bicycle hub assembly according to the eighteenth aspect, it is possible to enlarge the minimum inner diameter of the axle of the axle through hole of the hub axle, so as to improve the strength of the wheel fastening axle.

According to a nineteenth aspect of the present invention, the bicycle hub assembly according to the eighteenth aspect is configured so that the hub axle has a maximum outer diameter of one axle equal to or greater than 20 mm.

With the bicycle hub assembly according to the nineteenth aspect, it is possible to further enlarge the minimum inner diameter of the axle of the axle through hole of the axle of the hub, so as to improve the strength of the wheel fastening shaft.

According to a twentieth aspect of the present invention, the bicycle hub assembly according to the eighteenth aspect is configured so that the maximum outer diameter of the hub shaft of the hub shaft is 23 mm or less.

With the bicycle hub assembly according to the twentieth aspect, it is possible to obtain a necessary internal space between the sprocket support structure and the hub shaft, and thereby improve one degree of freedom in designing the bicycle hub assembly .

According to a twenty-first aspect of the present invention, a bicycle transmission system assembly includes the bicycle hub assembly and the bicycle sprocket assembly according to the first aspect. The sprocket supporting structure has a supporting maximum outer diameter. The bicycle sprocket assembly includes a first sprocket having a first inner diameter that is less than one of the largest outer diameters of the support of the hub shaft.

With the bicycle transmission system assembly according to the twenty-first aspect, the bicycle sprocket assembly may have a wider transmission ratio range.

According to a twenty-second aspect of the present invention, the bicycle transmission system assembly according to the twenty-first aspect is configured so that the sprocket supporting structure has a minimum supporting outer diameter. The first inner diameter of the first sprocket is smaller than the minimum outer diameter of the support.

With the bicycle transmission system assembly according to the twenty-second aspect, the bicycle sprocket assembly can have a wider transmission ratio range.

According to a twenty-third aspect of the present invention, the bicycle transmission system assembly according to the twenty-first aspect is configured so that the bicycle sprocket assembly includes a plurality of sprocket wheels including the first sprocket wheel. . The first sprocket has a first pitch circle diameter. The first pitch circle diameter is the smallest pitch circle diameter of the plurality of sprocket wheels.

With the bicycle transmission system assembly according to the twenty-third aspect, the bicycle sprocket assembly may have a wider transmission ratio range.

According to a twenty-fourth aspect of the present invention, the bicycle transmission system assembly according to the twenty-first aspect further includes a first locking member configured to prevent the first locking member from being attached to the first locking member. In one state of the sprocket support structure, the bicycle sprocket assembly moves axially relative to one of the sprocket support structures. The first locking member includes a first internally threaded portion to be screwed with the first externally threaded portion.

With the bicycle transmission system assembly according to the twenty-fourth aspect, it is possible to securely secure the bicycle sprocket assembly to the sprocket support structure in the axial direction by the first locking member. .

According to a twenty-fifth aspect of the present invention, the bicycle transmission system assembly according to the twenty-fourth aspect is configured so that the first locking member has a first axial end and a second axial direction. And extends between the first axial end and the second axial end in the axial direction. In a state where the first internally threaded portion and the first externally threaded portion are screwed together, the first internally threaded portion is disposed between the first axial end and the first torque-transmitting pattern. One of the first axial ends has a thickness ranging from 0.5 mm to 1.5 mm.

With the bicycle transmission system assembly according to the twenty-fifth aspect, it is possible to suppress the enlargement of the first locking member.

Embodiments will now be described with reference to the accompanying drawings, wherein like reference numerals indicate corresponding or identical elements throughout the various drawings.

Referring initially to FIG. 1, a bicycle transmission system assembly 10 according to an embodiment includes a bicycle sprocket assembly 12, a bicycle hub assembly 14, and a brake rotor 16. The bicycle hub assembly 14 is fastened to a bicycle frame BF. The bicycle sprocket assembly 12 is mounted on the bicycle hub assembly 14. The brake rotor 16 is mounted on the bicycle hub assembly 14. The bicycle transmission system assembly 10 may further include a crank assembly 18 and a bicycle chain 20. The crank assembly 18 includes a crank shaft 22, a right crank arm 24, a left crank arm 26, and a front sprocket 28. The right crank arm 24 and the left crank arm 26 are fastened to the crank shaft 22. The front sprocket 28 is fastened to at least one of the crank shaft 22 and the right crank arm 24. The bicycle chain 20 meshes with the front sprocket 28 and the bicycle sprocket assembly 12 to transmit the pedaling force from the front sprocket 28 to the bicycle sprocket assembly 12. The crank assembly 18 includes a front sprocket 28 as a single sprocket. However, the crank assembly 18 may include a plurality of front sprockets.

In this application, the following directional terms "front", "back", "forward", "backward", "left", "right", "horizontal", "upward" and "downward" and any other Similar directional terms refer to the directions determined based on a user (eg, a cyclist) sitting on the seat (not shown) of a bicycle (not shown) and facing the handlebar. Therefore, these terms used to describe the bicycle transmission system assembly 10 should be interpreted relative to a bicycle equipped with the bicycle transmission system assembly 10 as used in a vertical riding position on a horizontal plane.

As seen in FIG. 2, the bicycle sprocket assembly 12 includes a plurality of sprocket wheels. The bicycle sprocket assembly 12 includes a first sprocket SP1 and an eleventh sprocket SP11. The first sprocket SP1 is the smallest sprocket among the plurality of sprocket wheels. The eleventh sprocket SP11 is the largest sprocket among the plurality of sprocket wheels. The bicycle sprocket assembly 12 includes nine additional sprocket SP2 placed between the first sprocket SP1 and the eleventh sprocket SP11 in an axial direction D1 about one of the rotation center axes A1 of the bicycle hub assembly 14 To SP10. However, the total number of sprocket wheels of the bicycle sprocket assembly 12 is not limited to this embodiment. The first sprocket SP1 and the eleventh sprocket SP11 may be referred to as a sprocket SP1 and SP11, respectively. The additional sprockets SP2 to SP10 may also be referred to as sprockets SP2 to SP10, respectively.

As seen in FIG. 2, the bicycle hub assembly 14 includes a hub shaft 30, a hub body 32, a sprocket support structure 34, and a brake rotor support structure 36. The hub body 32 is rotatably supported on the hub shaft 30 around a rotation center axis A1 of the bicycle hub assembly 14. The hub body 32 has a first body end 32A and a second body end 32B. The second body end 32B is opposed to the first body end 32A in the axial direction D1 with respect to the rotation center axis A1. In this embodiment, the first body end 32A is the right end of the hub body 32, and the second body end 32B is the left end of the hub body 32. However, the first body end 32A may be a left end, and the second body end 32B may be a right end.

The sprocket support structure 34 is configured to support the bicycle sprocket assembly 12. The sprocket support structure 34 is closer to the first body end 32A than the brake rotor support structure 36 in the axial direction D1. The sprocket support structure 34 is rotatably mounted on the hub shaft 30 about a rotation center axis A1.

As seen in FIG. 2, the bicycle transmission system assembly 10 further includes a first locking member 50. The first lock member 50 is configured to prevent axial movement of the bicycle sprocket assembly 12 relative to the sprocket support structure 34 in a state where the first lock member 50 is attached to the sprocket support structure 34. The first locking member 50 is provided between the sprocket support structure 34 and the sprocket SP2 to SP10 in a radial direction with respect to one of the rotation center axes A1.

As seen in FIG. 2, the brake rotor support structure 36 is configured to support the brake rotor 16. A brake rotor supporting structure 36 is provided at the second body end 32B. The brake rotor support structure 36 is rotatably mounted on the hub shaft 30 about a rotation center axis A1. The brake rotor support structure 36 is coupled to the hub body 32 to rotate integrally with the hub body 32 relative to the hub shaft 30 about the rotation center axis A1. In this embodiment, the brake rotor support structure 36 and the hub body 32 are integrally provided as a one-piece integral component. However, the brake rotor support structure 36 may be a separate component from the hub body 32.

As seen in FIG. 3, the hub shaft 30 includes a shaft inner peripheral surface 30A and a shaft through hole 30B. The inner peripheral surface 30A of the axle defines an axle through hole 30B of the hub axle 30. The wheel fastening shaft WS is configured to extend through the axle through hole 30B to fasten the bicycle hub assembly 14 to the bicycle frame BF (FIG. 1).

As seen in FIG. 3, the bicycle hub assembly 14 includes a bearing 60. The bearing 60 is provided between the sprocket support structure 34 and the hub shaft 30 in a radial direction with respect to the rotation center axis A1. The bearing 60 is configured to rotatably support the sprocket support structure 34 relative to the hub shaft 30. The bearing 60 includes a plurality of rolling elements 60A. The plurality of rolling elements 60A are rotatable around a rotation center axis A1 along an outer peripheral surface of the hub shaft 30.

Similarly, the bicycle hub assembly 14 includes a bearing 62. The bearing 62 is provided between the sprocket support structure 34 and the hub shaft 30 in a radial direction with respect to the rotation center axis A1. The bearing 62 is configured to rotatably support the sprocket support structure 34 relative to the hub shaft 30. The bearing 62 includes a plurality of rolling elements 62A. The plurality of rolling elements 62A are rotatable around the rotation center axis A1 along the outer peripheral surface of the hub shaft 30. That is, the bicycle hub assembly 14 in this embodiment includes two bearings. However, the number of bearings is not limited to this embodiment.

The sprocket support structure 34 is a separate component from the hub body 32. The bicycle hub assembly 14 includes a ratchet structure 38. The sprocket support structure 34 is operatively coupled to the hub body 32 by the ratchet structure 38. The ratchet structure 38 is configured to couple the sprocket support structure 34 to the hub body 32 in one direction of rotation to rotate the sprocket support structure 34 with the hub body 32 during pedaling. The ratchet structure 38 is configured to allow the sprocket support structure 34 to rotate relative to the hub body 32 in other rotational directions during idle rotation. The ratchet structure 38 includes a structure known in the bicycle field. Therefore, for brevity, it will not be described in detail here.

As seen in FIG. 4, the sprocket support structure 34 includes a first torque transmitting pattern 40 and a first externally threaded portion 42. The first torque transmission pattern 40 is configured to transmit a rotational force F1 between the sprocket support structure 34 and the bicycle sprocket assembly 12. As seen in FIG. 2, the first torque transmission pattern 40 is closer to the first main body end 32A than the first externally threaded portion 42 in the axial direction D1. The first torque transmission pattern 40 is provided between the first externally threaded portion 42 and the first body end 32A in the axial direction D1. The first externally threaded portion 42 is disposed axially outward from the first torque transmitting pattern 40 in the axial direction D1. The first torque transmission pattern 40 is disposed between the first externally threaded portion 42 and the second body end 32B in the axial direction D1. However, the positions of the first torque transmission pattern 40 and the first externally threaded portion 42 are not limited to this embodiment. As seen in FIG. 3, the plurality of rolling elements 60A are radially closer to the inner peripheral surface 30A of the axle of the hub axle 30 than to the first torque transmission pattern 40.

As seen in FIG. 4, the sprocket support structure 34 further includes a base portion 46 having a tubular shape. The first torque transmission pattern 40 and the first externally threaded portion 42 are disposed on an outer peripheral surface 46A of the base portion 46. The sprocket support structure 34 includes a sprocket stopper 47. The first torque transmission pattern 40 is provided between the first externally threaded portion 42 and the sprocket stopper 47 in the axial direction D1. The sprocket support structure 34 further includes a smaller diameter portion 45. An outer peripheral surface 45A of one of the smaller diameter portions 45 has an outer diameter smaller than the outer diameter of the outer peripheral surface 46A of the base portion 46. In this embodiment, the smaller-diameter portion 45 is farther from the sprocket stopper 47 than the base portion 46 in the axial direction D1. However, the position of the smaller-diameter portion 45 is not limited to this embodiment.

The first torque-transmitting pattern 40 includes at least one external spline tooth 44. The at least one outer spline tooth 44 is configured to mesh with one of the sprocket splines 48 of the bicycle sprocket assembly 12 (FIG. 3). In this embodiment, the first torque transmission pattern 40 includes a plurality of external spline teeth 44. The eleventh sprocket SP11, which is the largest sprocket among these sprocket wheels, includes a plurality of sprocket teeth 48 (FIG. 3). However, the total number of one of the external spline teeth 44 is not limited to this embodiment. The total number of one of the sprocket teeth 48 is not limited to this embodiment.

As seen in FIG. 5, the first locking member 50 includes a first axial end 52A and a second axial end 50B. The second axial end 52B is opposed to the first axial end 52A in the axial direction D1. The first locking member 50 extends between the first axial end 52A and the second axial end 52B in the axial direction D1. In a state where the first locking member 50 is attached to the sprocket support structure 34 (FIG. 3), in the axial direction D1, the first axial end 52A is spaced from the first main body of the hub body 32 than the second axial end 52B End 32A is far. In a state where the bicycle sprocket assembly 12 is mounted on the bicycle hub assembly 14 (FIG. 3), the first axial end 52A is farther from the first body end 32A than the second sprocket SP2 in the axial direction D1. The thickness T1 of the first axial end 52A ranges from 0.5 mm to 1.5 mm. In this embodiment, the thickness T1 of the first axial end 52A is 1 mm. However, the thickness T1 of the first axial end 52A is not limited to this embodiment and the above range.

The first locking member 50 further includes a first internally threaded portion 54 and a plurality of slits 56. The first internally threaded portion 54 is configured to be threadedly engaged with the first externally threaded portion 42 of the sprocket support structure 34 (FIG. 3). The first internally threaded portion 54 is closer to the second axial end 52B in the axial direction D1 than to the first axial end 52A. However, the position of the first internally threaded portion 54 is not limited to this embodiment. The plurality of slits 56 are provided at the first axial end 52A to engage with an attachment tool (not shown). The slit 56 extends in the axial direction D1 toward the second axial end 52B. The rotation of the first locking member 50 by the attachment tool causes the first internally threaded portion 54 to be screwed with the first externally threaded portion 42 of the sprocket support structure 34 (FIG. 3).

As seen in FIG. 3, in a state where the first lock member 50 is attached to the sprocket support structure 34, the eleventh sprocket SP11 is provided in the axial direction D1 on the first lock member 50 and the sprocket stopper 47 between. The first lock member 50 is rotatably coupled to the sprockets SP1 to SP11 around the rotation center axis A1. The first locking member 50 is coupled to the sprocket SP1 to SP11 to move integrally with the sprocket SP1 to SP11 in the axial direction D1. In this embodiment, the sprockets SP1 to SP10 are integrally provided with each other as a one-piece integral component, and the sprocket SP11 is a separate component from the sprockets SP1 to SP10. However, the sprocket SP11 may be provided integrally with the sprocket SP1 to SP10 as a one-piece integral component. That is, the bicycle sprocket assembly 12 may be a one-piece integral component. In addition, at least one of the sprockets SP1 to SP10 may be a separate component from the other of the sprockets SP1 to SP10.

As seen in FIG. 2, the bicycle hub assembly 14 further includes a second locking member 64. The second lock member 64 is configured to prevent axial movement of the brake rotor 16 relative to the brake rotor support structure 36 in a state where the second lock member 64 is attached to the brake rotor support structure 36. The second locking member 64 is fastened to the brake rotor support structure 36.

As seen in FIG. 3, the axle shaft through hole 30B of the axle shaft 30 has one of the axle minimum inner diameters BD1 equal to or greater than 13 mm. The axle minimum inner diameter BD1 of the axle through hole 30B is preferably equal to or greater than 14 mm. The axle minimum inner diameter BD1 of the axle through hole 30B is preferably equal to or less than 21 mm. In this embodiment, the minimum inner diameter BD1 of the axle of the axle through hole 30B is 15 mm. However, the axle minimum inner diameter BD1 is not limited to this embodiment and above.

The wheel hub shaft 30 has a wheel hub maximum outer diameter BD2 equal to or larger than 17 mm. The maximum outer diameter BD2 of the hub axle 30 is preferably equal to or greater than 20 mm. The maximum outer diameter BD2 of the hub shaft 30 is preferably 23 mm or less. In this embodiment, the maximum outer diameter BD2 of the axle of the hub axle 30 is 21 mm. However, the maximum outer diameter BD2 of the hub axle 30 is not limited to this embodiment and the above range. In this embodiment, the frame contact surface 30S of the hub axle 30 has the maximum outer diameter BD2 of the axle. The frame contact surface 30S is provided at one axial end of the hub shaft 30 in the axial direction D1. The frame contact surface 30S is configured to contact the bicycle frame BF in a state where the bicycle hub assembly 14 is mounted on the bicycle frame BF. However, another part of the hub axle 30 may have the maximum outer diameter BD2 of the axle.

As seen in FIG. 6, the sprocket support structure 34 has a support maximum outer diameter SD1 and a support minimum outer diameter SD2. In this embodiment, the sprocket stopper 47 has a supporting maximum outer diameter SD1, and the smaller diameter portion 45 has a supporting minimum outer diameter SD2. However, other parts of the sprocket support structure 34 may have a support maximum outer diameter SD1 and a support minimum outer diameter SD2, respectively. As seen in Fig. 7, the minimum support outer diameter SD2 is larger than the minimum axle inner diameter BD1. However, the support minimum outer diameter SD2 may be equal to or smaller than the axle minimum inner diameter BD1.

As seen in FIG. 6, at least one outer spline tooth 44 of the first torque transmission pattern 40 has an outer spline large diameter ED31 and an outer spline small diameter ED32. As seen in FIG. 7, the large external spline diameter ED31 and the small external spline diameter ED32 are larger than the minimum internal diameter BD1 of the axle. The difference between the large external diameter ED31 of the external spline and the minimum internal diameter BD1 of the axle of the axle through hole 30B is equal to or less than 22 mm. The difference between the outer spline large diameter ED31 and the axle minimum inner diameter BD1 is preferably equal to or less than 21 mm. The difference between the outer spline large diameter ED31 and the axle minimum inner diameter BD1 is preferably equal to or greater than 13 mm. In this embodiment, the difference between the outer spline large diameter ED31 and the axle minimum inner diameter BD1 is 19.52 mm. However, the difference between the outer spline large diameter ED31 and the axle minimum inner diameter BD1 is not limited to this embodiment and the above range.

The difference between the outer spline small diameter ED32 and the minimum inner diameter BD1 of the axle is equal to or less than 20 mm. The difference between the outer spline small diameter ED32 and the axle minimum inner diameter BD1 is preferably equal to or less than 19 mm. The difference between the external spline small diameter ED32 and the axle minimum internal diameter BD1 is preferably equal to or greater than 12 mm. In this embodiment, the difference between the outer spline small diameter ED32 and the axle minimum inner diameter BD1 is 17.2 mm. However, the difference between the outer spline small diameter ED32 and the axle minimum inner diameter BD1 is not limited to this embodiment and the above range.

As seen in FIG. 6, the first externally threaded portion 42 has a first externally threaded large diameter ED33. As seen in FIG. 7, the first external thread large diameter ED33 is larger than the minimum inner diameter BD1 of the axle. The difference between the first outer thread large diameter ED33 and the axle minimum inner diameter BD1 is equal to or less than 19 mm. The difference between the first outer thread large diameter ED33 and the axle minimum inner diameter BD1 is preferably equal to or less than 18 mm. The difference between the first outer thread large diameter ED33 and the axle minimum inner diameter BD1 is more preferably equal to or greater than 11 mm. In this embodiment, the difference between the first outer thread large diameter ED33 and the axle minimum inner diameter BD1 is equal to 17 mm. However, the difference between the first large external thread ED33 and the minimum inner diameter BD1 of the axle is not limited to this embodiment and the above range.

As seen in FIG. 7, the difference between the support minimum outer diameter SD2 and the axle minimum inner diameter BD1 is equal to or less than 15 mm. The difference between the support minimum outer diameter SD2 and the axle minimum inner diameter BD1 is preferably equal to or less than 14 mm. The difference between the support minimum outer diameter SD2 and the axle minimum inner diameter BD1 is preferably equal to or greater than 7 mm. In this embodiment, the difference between the support minimum outer diameter SD2 and the axle minimum inner diameter BD1 is 13 mm. However, the difference between the support minimum outer diameter SD2 and the axle minimum inner diameter BD1 is not limited to this embodiment and the above range.

As seen in FIG. 8, the first sprocket SP1 has a first pitch circle diameter PCD1. The second sprocket SP2 has a second pitch circle diameter PCD2. The third sprocket SP3 has a third pitch circle diameter PCD3. The fourth sprocket SP4 has a fourth pitch circle diameter PCD4. The fifth sprocket SP5 has a fifth pitch circle diameter PCD5. The sixth sprocket SP6 has a sixth pitch circle diameter PCD6. The seventh sprocket SP7 has a seventh pitch circle diameter PCD7. The eighth sprocket SP8 has an eighth pitch circle diameter PCD8. The ninth sprocket SP9 has a ninth pitch circle diameter PCD9. The tenth sprocket SP10 has a tenth pitch circle diameter PCD10. The eleventh sprocket SP11 has an eleventh section circle diameter PCD11. In this embodiment, the first pitch circle diameter PCD1 of the first sprocket SP1 is the smallest pitch circle diameter among the sprockets SP1 to SP11. However, the first pitch circle diameter PCD1 of the first sprocket SP1 may be larger than the minimum pitch circle diameter.

The first sprocket SP1 has a first pitch circle PC1, which has a first pitch circle diameter PCD1. The second sprocket SP2 has a second pitch circle PC2, which has a second pitch circle diameter PCD2. The third sprocket SP3 has a third pitch circle PC3, which has a third pitch circle diameter PCD3. The fourth sprocket SP4 has a fourth pitch circle PC4, which has a fourth pitch circle diameter PCD4. The fifth sprocket SP5 has a fifth pitch circle PC5, which has a fifth pitch circle diameter PCD5. The sixth sprocket SP6 has a sixth pitch circle PC6, which has a sixth pitch circle diameter PCD6. The seventh sprocket SP7 has a seventh pitch circle PC7, which has a seventh pitch circle diameter PCD7. The eighth sprocket SP8 has an eighth pitch circle PC8, which has an eighth pitch circle diameter PCD8. The ninth sprocket SP9 has a ninth pitch circle PC9, which has a ninth pitch circle diameter PCD9. The tenth sprocket SP10 has a tenth pitch circle PC10, which has a tenth pitch circle diameter PCD10. The eleventh sprocket SP11 has an eleventh section circle PC11, which has an eleventh section circle diameter PCD11.

The first pitch circle PC1 of the first sprocket SP1 is defined by the center axis of the pin of the bicycle chain 20 (FIG. 1) meshing with the first sprocket SP1. Define the second node circle PC2 to the eleventh node circle PC11, and the first node circle PC1. Therefore, for the sake of brevity, they will not be described in detail here.

The first to eleventh sprockets SP1 to SP11 each have an inner diameter. Specifically, as seen in FIG. 7, the first sprocket SP1 has a first inner diameter SID1. The second sprocket SP2 has a second inner diameter SID2. The first inner diameter SID1 is the smallest diameter among the inner diameters of the sprockets SP1 to SP11. The second inner diameter SPD2 is the second smallest diameter among the inner diameters of the sprockets SP1 to SP11. In this embodiment, the first inner diameter SID1 of the first sprocket SP1 is smaller than the maximum outer diameter SD1 of the support. The first inner diameter SID1 is smaller than the minimum support outer diameter SD2. However, the first inner diameter SID1 of the first sprocket SP1 may be equal to or larger than the maximum outer diameter SD1 of the support. The first inner diameter SID1 may be equal to or larger than the support minimum outer diameter SD2.

Similarly, the second inner diameter SID2 of the second sprocket SP2 is smaller than the supporting maximum outer diameter SD1. The second inner diameter SID2 is smaller than the minimum support outer diameter SD2. However, the second inner diameter SID2 of the second sprocket SP2 may be equal to or larger than the maximum outer diameter SD1 of the support. The second inner diameter SID2 may be equal to or larger than the support minimum outer diameter SD2.

The term "comprising" and its derivatives as used herein are intended to specify the presence of stated features, elements, components, groups, integers, and / or steps but do not exclude other unstated features, elements, components, groups, integers, and Open term for the presence of steps. This concept also applies to words of similar meaning, for example, the terms "have", "include" and their derivatives.

The terms "part", "section", "portion", "part", "component", "body" and "structure" when used in the singular can have a single part or a plurality of parts significance.

Ordinal numbers such as "first" and "second" described in this application are only identifiers and have no other meaning, such as a specific order and the like. Further, for example, the term "first element" itself does not imply the existence of a "second element", and the term "second element" itself does not imply the existence of a "first element".

In addition to configurations in which the paired elements have the same shape or structure as each other, the term "pair of" as used herein may also cover configurations in which the paired elements have different shapes or structures from each other.

Thus, the terms "a", "one or more", and "at least one" are used interchangeably herein.

Finally, terms of degree such as "substantially", "about" and "approximately" as used herein mean a reasonable amount of deviation from the modified term such that the end result has not changed significantly. All numerical values described in this application can be understood to include terms such as "substantially", "about" and "approximately".

Obviously, many modifications and variations of the present invention are possible based on the above teachings. It should therefore be understood that the invention may be practiced in other ways than that specifically described herein within the scope of the appended patent applications.

10‧‧‧ Bicycle Transmission System Assembly

12‧‧‧ Bicycle sprocket assembly

14‧‧‧ Bicycle wheel assembly

16‧‧‧brake rotor

18‧‧‧ crank assembly

20‧‧‧ Bicycle chain

22‧‧‧ crank shaft

24‧‧‧Right crank arm

26‧‧‧Left crank arm

28‧‧‧ front sprocket

30‧‧‧ hub axle

30A‧‧‧Axial inner peripheral surface

30B‧‧‧Axle through hole

30S‧‧‧Frame contact surface

32‧‧‧Wheel body

32A‧‧‧first main body

32B‧‧‧Second main body

34‧‧‧Sprocket support structure

36‧‧‧brake rotor support structure

38‧‧‧ Ratchet structure

40‧‧‧ the first torque transmission type

42‧‧‧ the first external thread part

44‧‧‧ External spline teeth

45‧‧‧Small diameter part

45A‧‧‧Outer peripheral surface of smaller diameter part

46‧‧‧ base

46A‧‧‧outer peripheral surface

47‧‧‧ sprocket stopper

48‧‧‧ sprocket spline teeth

50‧‧‧first locking part

52A‧‧‧first axial end

52B‧‧‧Second axial end

54‧‧‧First internal thread part

56‧‧‧ slit

60‧‧‧bearing

60A‧‧‧Rolling element

62‧‧‧bearing

62A‧‧‧Rolling element

64‧‧‧Second locking component

A1‧‧‧rotation center axis

BD1‧‧‧ Minimum Axle Diameter

BD2‧‧‧ maximum outside diameter

BF‧‧‧Bicycle frame

D1‧‧‧ axial direction

ED31‧‧‧Outer spline diameter

ED32‧‧‧External Spline Trail

ED33‧‧‧The first external thread diameter

F1‧‧‧rotating force

PC1‧‧‧First Section Circle

PC2‧‧‧Second Section Circle

PC3‧‧‧The third quarter

PC4‧‧‧Fourth Circle

PC5‧‧‧Fifth Round

PC6‧‧‧Sixth Circle

PC7‧‧‧Seventh Round

PC8‧‧‧ Eighth Round

PC9‧‧‧9th Round

PC10‧‧‧Tenth Circle

PC11 ‧‧‧ eleventh round

PCD1‧‧‧First pitch circle diameter

PCD2‧‧‧Second pitch circle diameter

PCD3‧‧‧The third circle diameter

PCD4‧‧‧The fourth circle diameter

PCD5‧‧‧The fifth circle diameter

PCD6‧‧‧The sixth circle diameter

PCD7‧‧‧Circle diameter

PCD8‧‧‧eighth circle diameter

PCD9‧‧‧The ninth circle diameter

PCD10‧‧‧Tenth Circle Diameter

PCD11‧‧‧The eleventh circle diameter

SD1‧‧‧Support maximum outer diameter

SD2‧‧‧Minimal outer diameter of support

SID1‧‧‧First inner diameter

SID2‧‧‧Second inner diameter

SP1‧‧‧First Sprocket

SP2‧‧‧Second Sprocket

SP3‧‧‧Third Sprocket

SP4‧‧‧Fourth sprocket

SP5‧‧‧Fifth Sprocket

SP6‧‧‧The sixth sprocket

SP7‧‧‧Seventh Sprocket

SP8‧‧‧Eight Sprocket

SP9‧‧‧Ninth Sprocket

SP10‧‧‧Tenth Sprocket

SP11‧‧‧ eleventh sprocket

T1‧‧‧thickness of the first axial end

WS‧‧‧ Wheel fastening shaft

With reference to the following detailed description considered in conjunction with the accompanying drawings, a more complete understanding of the present invention and its many attendant advantages will be readily available and equally well understood.

FIG. 1 is a schematic diagram of a bicycle transmission system assembly according to an embodiment.

FIG. 2 is a rear view of the bicycle transmission system assembly illustrated in FIG. 1.

3 is a cross-sectional view of a bicycle hub assembly, a bicycle sprocket assembly, and a first locking member of the bicycle transmission system assembly illustrated in FIG. 1.

4 is a perspective view of a sprocket support structure of a bicycle hub assembly of the bicycle transmission system assembly illustrated in FIG. 1.

5 is a cross-sectional view of a first locking member of the bicycle transmission system assembly illustrated in FIG. 1.

6 is a cross-sectional view of a sprocket support structure of a bicycle hub assembly of the bicycle transmission system assembly illustrated in FIG. 1.

7 is an enlarged cross-sectional view of a bicycle hub assembly, a bicycle sprocket assembly, and a first locking member of the bicycle transmission system assembly illustrated in FIG. 1.

8 is a side view of the bicycle sprocket assembly of the bicycle transmission system assembly illustrated in FIG. 1.

Claims (25)

A bicycle wheel hub assembly includes: a wheel hub shaft including a wheel shaft through hole having a minimum inner diameter of one wheel shaft equal to or greater than 13 mm; and a wheel hub body surrounding a center axis of rotation of the bicycle wheel shaft assembly. Rotatably supported on the hub shaft, the hub body having a first main body end and a second main body end opposite to the first main body end in an axial direction about the rotation center axis; and a sprocket support A structure that is rotatably mounted on the hub shaft around the rotation center axis of the bicycle hub assembly, and the sprocket support structure includes: a first torque-transmitting type configured to be mounted on the sprocket support structure Transmitting a rotational force with a bicycle sprocket assembly; and a first externally threaded portion configured to be screwed with a first internally threaded portion of a first locking member, the first torque transmitting pattern It is closer to the first main body end than the first externally threaded portion in the axial direction. The bicycle hub assembly of claim 1, wherein the first torque-transmitting pattern includes at least one external spline tooth configured to mesh with an internal spline tooth of the bicycle sprocket assembly, the at least one external spline The key teeth have an outer spline diameter larger than the minimum inner diameter of the axle of the axle through hole, and a difference between the outer diameter of the outer spline and the smallest inner diameter of the axle is 22 mm or less. As in the bicycle hub assembly of claim 2, wherein the difference between the large diameter of the external spline and the minimum internal diameter of the axle is equal to or less than 21 mm. As in the bicycle hub assembly of claim 2, wherein the difference between the large diameter of the external spline and the minimum internal diameter of the axle is equal to or greater than 13 mm. The bicycle hub assembly of claim 1, wherein the first torque-transmitting pattern includes at least one external spline tooth configured to mesh with an internal spline tooth of the bicycle sprocket assembly, the at least one external spline The key teeth have an external spline diameter that is larger than the minimum inner diameter of the axle of the axle through hole, and a difference between the external diameter of the external spline and the minimum inner diameter of the axle is equal to or less than 20 mm. As in the bicycle hub assembly of claim 5, wherein the difference between the outer diameter of the external spline and the minimum inner diameter of the axle is 19 mm or less. As in the bicycle hub assembly of claim 5, wherein the difference between the outer diameter of the external spline and the minimum inner diameter of the axle is equal to or greater than 12 mm. The bicycle hub assembly of claim 1, wherein the first externally threaded portion has a first externally threaded diameter larger than one of the smallest internal diameters of the axle, and the distance between the first externally threaded diameter and the minimum inner diameter of the axle The difference is equal to or less than 19 mm. As in the bicycle hub assembly of claim 8, wherein the difference between the major diameter of the first external thread and the smallest inner diameter of the axle is equal to or less than 18 mm. As in the bicycle hub assembly of claim 8, wherein the difference between the major diameter of the first external thread and the smallest inner diameter of the axle is equal to or greater than 11 mm. As in the bicycle hub assembly of claim 1, wherein the sprocket support structure has a support minimum outer diameter larger than the minimum inner diameter of the axle of the axle through hole, and The difference is 15 mm or less. As in the bicycle hub assembly of claim 11, wherein the difference between the minimum outer diameter of the support and the minimum inner diameter of the axle is equal to or less than 14 mm. As in the bicycle hub assembly of claim 11, wherein the difference between the minimum outer diameter of the support and the minimum inner diameter of the axle is equal to or greater than 7 mm. The bicycle hub assembly according to claim 1, further comprising a bearing disposed between the sprocket support structure and the hub shaft to rotatably support the sprocket support structure relative to the hub shaft. The bicycle hub assembly of claim 14, wherein the hub axle includes an inner peripheral surface of the axle defining one of the through holes of the axle, the bearing includes a plurality of rolling elements, and the plurality of rolling elements are radially closer to the inner peripheral surface of the axle. Rather than closer to the first torque-transmitting pattern. For the bicycle rear hub assembly of claim 1, wherein the minimum inner diameter of the axle of the axle through hole is equal to or greater than 14 mm. If the bicycle rear hub assembly of claim 1, wherein the minimum inner diameter of the axle of the axle through hole is equal to or less than 21 mm. The bicycle rear hub assembly of claim 1, wherein the hub axle has a maximum outer diameter of one axle equal to or greater than 17 mm. The bicycle rear hub assembly of claim 18, wherein the maximum outer diameter of the hub of the hub axle is equal to or greater than 20 mm. If the bicycle rear hub assembly of claim 18, wherein the maximum outer diameter of the hub of the hub axle is 23 mm or less. A bicycle transmission system assembly comprising: the bicycle hub assembly of claim 1, the sprocket support structure having a maximum supported outer diameter; and the bicycle sprocket assembly including a first sprocket, the first A sprocket has a first inner diameter that is less than one of the largest outer diameters of the support of the hub shaft. The bicycle transmission system assembly of claim 21, wherein the sprocket support structure has a minimum support outer diameter, and the first internal diameter of the first sprocket is smaller than the minimum support outer diameter. The bicycle transmission system assembly of claim 21, wherein the bicycle sprocket assembly includes a plurality of sprocket wheels including the first sprocket wheel, the first sprocket wheel has a first pitch circle diameter, and the first pitch circle The diameter is the smallest pitch circle diameter among the plurality of sprocket wheels. The bicycle transmission system assembly of claim 21, further comprising the first locking member configured to prevent the bicycle sprocket assembly in a state where the first locking member is attached to one of the sprocket support structures. Relative to one of the sprocket support structures moving axially, the first locking member includes the first internally threaded portion to be screwed with the first externally threaded portion. The bicycle transmission system assembly of claim 24, wherein the first locking member has a first axial end and a second axial end, and the first axial end and the second axial end are in the axial direction. Extending between the axial ends, in a state where the first internal thread portion and the first external thread portion are screwed together, the first internal thread portion is disposed at the first axial end and the first torque transmitting pattern And one of the first axial ends has a thickness ranging from 0.5 mm to 1.5 mm.